/******************************************************************************
 * Project:		Packet Sniffer
 * Author:		Jonathan Buttner
 * Date:		1.15.2010
 * 
 * This file will take care of connecting to the network using a device.
 *****************************************************************************/

/******************************************************************************
 * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
 * Copyright (c) 2005 - 2006 CACE Technologies, Davis (California)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Politecnico di Torino, CACE Technologies 
 * nor the names of its contributors may be used to endorse or promote 
 * products derived from this software without specific prior written 
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include "Connection.h"

/******************************************************************************
 * determineDev() allows the user to pick the device to use to sniff packets
 *
 * Pre:
 *	device points to a pcap_if_t that will soon hold the selected device.
 * Post:
 *	device points to the device that was selected
 * Return:
 *	returns an Error message
 *
 *****************************************************************************/
Error determineDev( pcap_if_t *const device ) /* may want to just get the device->name */
{
	pcap_if_t *alldevs;
	pcap_if_t *d;
	int inum;
	int i=0;
	char errbuf[PCAP_ERRBUF_SIZE];
	  
	/* Retrieve the device list on the local machine */
	if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)
	{
		fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
		return NOTOK;
	}
    
	/* Print the list */
	for(d=alldevs; d; d=d->next)
	{
		//printf("%d. %s", ++i, d->name);
		++i;
		if (d->description)
			printf(" (%s)\n", d->description);
		else
			printf(" (No description available)\n");
	}
    
	if(i==0)
	{
		printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
		return NOTOK;
	}
    
	printf("Enter the interface number (1-%d):",i);
	scanf_s("%d", &inum);
    
	if(inum < 1 || inum > i)
	{
		printf("\nInterface number out of range.\n");
		/* Free the device list */
		pcap_freealldevs(alldevs);
		return NOTOK;
	}
    
	/* Jump to the selected adapter */
	for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
	
	*device = *d;

	//pcap_freealldevs(alldevs);
	return OK;
}
